<!DOCTYPE html>
<html lang="zh_CN">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <h1>hello world</h1>

  <script>
    // fetch("http://localhost:91/")
    // .then(res =>res.text())
    // .then(data => alert(data))

    function fn(word) {
      alert(word)

    }
  </script>
  <script src="http://localhost:91/?callback=fn"></script>
</body>
</html>